The Ministry of Health has updated its guidelines on how to apply the Drinking Water Standards. The guidelines help water suppliers to achieve the Standards and provide advice for achieving high level of water quality management. The date on the footer of each chapter or datasheet is an indication of when that section of the guidelines was last updated. It is recommended that anyone using these guidelines uses the web version https://www.health.govt.nz/publication/guidelines-drinking-water-quality-management-new-zealand. You should not print the guidelines, as chapters and datasheets are updated on an ongoing basis.